This radical abolitionist founded the American Anti-Slavery Society and owned the newspaper the “Liberator” which reflected extremist anti-slavery views.

http://en.wikipedia.org/wiki/American_Anti-Slavery_Society

The radical abolitionist who founded the American Anti-Slavery Society and owned the newspaper "Liberator" is William Lloyd Garrison. To find the answer to this question, you can follow these steps:

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By following these steps, you can find reliable information about William Lloyd Garrison and his role as a radical abolitionist, the founder of the American Anti-Slavery Society, and the owner of the newspaper "Liberator."